Coal charging cover and seal for the coal charging hole of a coke oven

ABSTRACT

Coal charging cover and seat for the coal charging hole of a coke oven are made substantially wholly of refractories, the coal charging cover being composed of a refractory body and an iron plate positioned on the top portion of the refractory body with which to operate the coal charging cover by an electromagnetic device and the coal charging seat being composed of one or more parts with the parts secured with each other. The coal charging cover and seat have excellent properties in durability, resistance to heat, deterioration, and sealability.

United States Patent [1 1 Irie et al.

[ COAL CHARGING COVER AND SEAL FOR THE COAL CHARGING HOLE OF A COKE OVEN [75] Inventors: Sadanao lrie, lzumisano; Kenichi Tomomoto, Kaizuka; Toyohiko Akahori; Kazuhisa Simomura, both of Bizen, all of Japan [73] Assignees: Osaka Gas Company, Ltd., Osaka;

Kyushu Refractories Co., Ltd., Bizen, both oflapan [22] Filed: Dec. [0, 1973 [2!] Appl. No.: 423,147

[30] Foreign Application Priority Data Dec. 9, l972 Japan .v 47l4l672 June I2, 1973 Japan .i 4869992 [52] US. Cl 202/247; l lO/l73 R; 202/267 [51] Int. CL... Cl0b 1/06; ClOb 25/06; ClOb 29/00 [58] Field of Search 202/251, 267, 250, 247, 202/248, 242; 126/192 19!, 73; ll0/l73,

[ Aug. 19, 1975 l [56] References Cited UNITED STATES PATENTS 2.201698 6/1940 SChITliClI 202/250 FOREIGN PATENTS OR APPLICATIONS 523,263 4/193l Germany i. 202/25] 3 l9,872 [Cl/I929 United Kingdom 202/242 Primary Examiner-Norman Yudkofi" Assistant ExaminerD. Sanders Attorney, Agent. or Firm-Stewart and Kolasch, Ltd.

[57] ABSTRACT Coal charging cover and seat for the coal charging hole of a coke oven are made substantially wholly of refractories, the coal charging cover being composed of a refractory body and an iron plate positioned on the top portion of the refractory body with which to operate the coal charging cover by an electromagnetic device and the coal charging seat being composed of one or more parts with the parts secured with each other. The coal charging cover and seat have excellent properties in durability, resistance to heat, deterioration, and scalability.

23 Claims, 12 Drawing Figures PATENTEB AUG 1 9 I975 51 IT l U? 4 liiiiiil PATENTED AUB I SL975 FIG. 7

PATENTED 3,900,369

saw 3 a? a FIG. 8

FIG. 9

FIG. IO

PATENTED AUG] 9l975 FIG. H

FIG. l2

COAL CHARGING COVER AND SEAL FOR THE COAL CHARGING HOLE OF A COKE OVEN The present invention relates to coal charging cover and seat for the coal charging hole of a coke oven. More particularly, it relates to a close-fitting covering or cover and seat for the coal charging hole of a coke oven.

Conventional coal charging cover and seat for the coal charging hole of a coke oven have a structure as illustrated as an example in FIG. I, which comprise the charging cover made of cast iron or cast steel 1 with insulating castable 8 filled therein or of cast iron alone, and the coal charging seat composed in combination of a cap 2 made of cast iron with a refractory body 16. The reason the conventional coal charging cover is made mainly of cast iron is simply based upon the fact that cast iron is to be easily shaped into a desirable form for that purpose. That cast iron is used for the coal charging cover also constitutes the major reason for the use of the coal charging seat in said combina tion. Moreover, it has been thought to be less stable and to cause the problem with the sealing of the charging seat if it is made wholly of a refractory material. It is not known that any other material than iron has been practically used for these purposes.

The coal charging cover and seat of a coke oven are always exposed to severe conditions such as high temperatures and the rapid change of temperatures which is brought about during the repeated procedures of re moving and setting the close-fitting covering for the coal charging hole in the coal feed operation. Moreover, there are often conducted in the coke oven operations after the completion of the coal carbonization the operations to reduce residual volatile matters present in coke by partly opening the coal charging cover prior to coke discharge. As a result, the heat distortion and cracking occur on the cover and seat so that the portions made of cast iron are forced to be trans formed. These heat damages and the oxidation abrasion make the sealing of the coal charging hole incomplete and the life of the cover and seat a short period of 2 or 3 years. These disadvantages are also undesirable in view of the coke oven integrity and working conditions.

Therefore, it is an object of the present invention to provide charging cover and seat for the coal charging hole of a coke oven which can avoid the disadvantages conventional ones possess.

Another object of the present invention is to provide a close-fitting charging cover and seat for the coal charging hole of a coke oven possessing desirable properties particularly with respect to durability, sealing, resistance to heat and deterioration.

Other objects, features and advantages will become apparent as the description proceeds. In the drawings:

FIG. I is a sectional view of a conventional covering or charging cover and seat for the coal charging hole of a coke oven;

FIG. 2 is a sectional view showing an example of charging cover and seat of the present invention;

FIG. 3 is a partial plan view of a preferred embodiment of the charging cover and seat of the present invention',

FIGS. 4, 5 and 6 are sectional views of exemplary charging covers of the present invention;

FIGS. 7, 9 and 10 are sectional views of exemplary charging seats of the present invention;

FIG. 8 is a partial plan view of an exemplary charging seat of the present invention; and

FIGS. 11 and 12, respectively, are plan views of examples of polygonal and round charging seats of the present invention.

As shown in FIG. 2, a charging cover is composed of a refractory body 3 with which an iron plate 6 is joined on the surface of the top portion of the refractory body so as to be capable of being operated by electromagnet for the removal and setting of the cover. In the center of the coal charging cover there is positioned a space portion 9 which may be provided with a handle 10, when desired, with which to open or close the charging cover by hand. A plurality of bolts or nuts 11 may be used to fasten the refractory body 3 and the iron plate 6 together. An adhesive resistant enough to high temperatures in the coke oven may be used without bolts and nuts for this purpose. It is preferred that there be positioned a heat insulating material 7 such as asbestos or the like between the refractory body and the iron plate. A space portion 12 also may be provided therebetween when desired.

In accordance with the present invention, a wide variety of shapes of an iron plate may be used; for example, an iron plate of the type that covers the shoulder portion of the refractory body as shown in FIG. 4; of the type that has the same shape as the upper portion of the refractory body on which the iron plate is positioned as shown in FIG. 5; and of the type that possesses a smaller shape than that of the refractory body as shown in FIG. 6. The shapes of the iron plate on the top portion of the refractory body of the coal charging cover are not limited to those illustrated above and in the drawings. In the practice of the present invention there may be used any shape thereof which only possesses an area sufficient enough for the coal charging cover to be effectively operated electromagnetically.

The coal charging seat of a coke oven according to the present invention is made substantially wholly of refractories. As shown in FIG. 7, the charging seat made of refractories is provided with a hollow portion 13 in which a fastening hardware 5 may be used to fix the seat to the coke oven tightly. FIG. 9 shows an example of a charging seat made of refractories which is provided with a hollow portion 13 where a fastening hardware 5 may be used and also with a spline I4 to fasten the seat to the coke oven tightly. FIG. 10 shows an embodiment of a seat which is made of refractories and privided with a foot portion 15 with which the coal charging seat is secured to the coke oven.

The plane shapes of the coal charging seat of the present invention may be varied widely. FIGS. 11 and 12, respectively, show the coal charging seat of the polygonal and round types. However, it is noted that the plane shapes of the charging seat are not limited to those illustrated above and in the accompanying drawings. As shown in FIG. 8, it is preferred that the coal charging seat of the present invention be composed of four parts, thereby leading to the ready prevention of the spalling and the easy formation of its shape. However, the coal charging seat of the present invention is not limited to the illustrated four-part one and may be composed of one or two or more parts.

The refractories of the present invention may include any material resistant to the spalling and abrasion such as refractory, refractory material, refractory composition, and the like, e.g., silicon carbide, silicon nitride, clay, high alumina, pure alumina, fused silica, zircon, cordierite, castable refractory, plastic refractory, gunning refractory, refractory brick, and the like. These refractories may be used alone or in combination with one or more others. When the refractories are used in combination, they may be bonded or joined together. Such use of the refractory materials may be preferred in view of the economical utilization of the refractory materials and the cost of their manufacture.

The coal charging seat of the present invention may be secured to the coke oven with a fastening hardware or a spline or a foot portion. An adhesive also may be used alone or together with such portion.

The coal charging cover to be used in the practice of the present invention may be set to a conventional coal charging seat with a cast iron cap 2 covering over the shoulder portion of the refractory body thereof. However, it is preferred that the coal charging cover is used with the coal charging seat made of a refractory material according to the present invention as shown in H08. 2, 7, 9, and 10. In this case, the charging cover and the seat are able to be set so tightly together that the gas is prevented fully from being leaked from the inside of the coke oven. Moreover, when the charging seat made of refractories is used with the refractory charging cover, although the former may be applied together with a conventional charging cover, the sealing of the cover and the seat is made complete because of their identical properties such as heat conductivity, expansion coefficient and the like. It is also practically effective to use the charging cover in the form of a disc because by doing so the rotary force is provided with the charging cover upon the operation of the electromagnetic removal and setting device and thus the sealing of the charging cover is improved.

The inner portion of the coal charging cover whose portion is always exposed to high temperatures in the coke oven is made of refractories so that they possess favorable properties in resistance to heat and deterioration. The side portion of the charging cover according to the present invention is also made of refractories, thus producing the property to be strong against the rapid change of temperatures and resulting in a remarkable reduction in the deformation to be caused due to the heat distortion or the oxidation damages as compared with conventional cast iron covers. The iron plate positioned on the top portion of the refractory body can serve to operate the electromagnetic removal and setting device for opening and setting the charging cover effectively so that it functions to get rid of an impact on the charging cover given by dropping it upon removal. It is thus possible to keep away from any element to damage the coal charging cover and thus prolong the life of the cover remarkably. Since the coal charging seat of the present invention is made of refrac tories, it also possesses the favorable properties as mentioned above for the refractory coal charging cover according to the present invention. The use of refractories for these purposes also can help to reduce amounts of tars, carbon, etc., to be attached to the inner portion of the cover and the seat of the coke oven, thus leading to the remarkable prolongation of the life of the coal charging cover and seat as compared with the conventional ones.

When a heat insulating material having an appropriate thickness or a space portion, when desired, is positioned between the refractory body and the iron plate in the coal charging cover of the present invention, they function to reduce the heat conductivity and the temperatures on the surface of the charging cover by more than C. as compared with the conventional one made of cast iron. Thus, these effects are extremely practically useful in view of the improvement of security in working operations and the heat economy.

We claim:

1. A coke oven charging-hole closure construction comprising a coke oven cover and a coal charging seat adapted to receive said coke oven cover in a tight relationship, thereby establishing a complete seal between the coke oven cover and the coal charging seat, at leat the contacting surfaces between said coke oven cover and said coal charging seat being made of a refractory body.

2. The construction of claim 1, wherein the coke oven cover is in the form of a disc.

3. The construction of claim 1, wherein the coke oven cover has a refractory body which contains an iron plate joined to at least a portion of the upper surface of said refractory body.

4. The construction of claim 3, wherein a hole portion is provided in the upper surface of the coke oven cover, said hole portion being provided with handle means.

5. The construction of claim 3, wherein the iron plate is joined to the refractory body by bolt means.

6. The construction of claim 3, wherein the iron plate is joined to the refractory body by an adhesive which is resistant to high temperature.

7. The construction of claim 3, wherein a heat insulating material is disposed between the iron plate and the refractory body.

8. The construction of claim 3, wherein a space portion is disposed between the refractory body and the iron plate.

9. The construction of claim 1, wherein the coal charging seat is made substantially wholly of a refractory body.

10. The construction of claim 1, wherein the coal charging seat is provided with a foot portion which is effective in securing the coal charging seat to a coke oven.

11. The construction of claim I, wherein the coke oven cover and the coal charging seat are each made substantially of a refractory body.

12. The construction of claim 1, wherein the refractory body is a refractory material selected from the group consisting of silicon carbide, silicon nitride, clay, high alumina, pure alumina, fused silica, zircon, cordierite, castable refractory, plastic refractory, gunning refractory and refractory brick.

13. The construction of claim 1, wherein the coal charging seat is composed of one or more parts secured to each other.

14. The construction of claim 13, wherein the coal charging seal is composed of four parts.

15. The construction of claim 1, wherein a hollow portion is positioned in the coal charging seat, said hollow portion being adapted to receive hardward for securing the charging seat to a coke oven.

16. The construction of claim I, wherein a spline portion is positioned in the coal charging seat, said spline portion being adapted to secure the charging seat to a coke oven.

17. A coal charging seat of a coke oven wherein said coal charging seat is made wholly of a refractory body.

18. The coal charging seat of claim 17, wherein said coal charging seat is provided with a foot portion which is effective in securing it to a coke oven.

19. The coal charging seat of claim 17, wherein the refractory body is a refractory material selected from the group consisting of silicon carbide, silicon nitride, clay, high alumina, pure alumina, fused silica, zircon, cordierite, castable refractory, plastic refractory, gunning refractory and refractory brick.

20. The coal charging seat of claim 17, wherein said ing seat to a coke oven. 

1. A COKE OVEN CHARGING-HOLE-CLOSURE CONSTRUCTION COMPRISIN A COKE OVEN COVER AND A COAL CHANGING SEAT ADAPTED TO RECEIVE SAID COKE OVEN COVER IN A TIGHT RELATIONSHIP, THEREBY ESTABLISHING A COMPLETE SEAL BETWEEN THE COKE OVEN COVER AND THE COAL CHANGING SEAT, AT LEAST THE CONTACTING SURFACES BETWEEN SAID COKE OVEN COVER AND SAID COAL CHANGING SEAT BEING MADE OF A REFRACTORY BODY.
 2. The construction of claim 1, wherein the coke oven cover is in the form of a disc.
 3. The construction of claim 1, wherein the coke oven cover has a refractory body which contains an iron plate joined to at least a portion of the upper surface of said refractory body.
 4. The construction of claim 3, wherein a hole portion is provided in the upper surface of the coke oven cover, said hole portion being provided with handle means.
 5. The construction of claim 3, wherein the iron plate is joined to the refractory body by bolt means.
 6. The construction of claim 3, wherein the iron plate is joined to the refractory body by an adhesive which is resistant to high temperature.
 7. The construction of claim 3, wherein a heat insulating material is disposed between the iron plate and the refractory body.
 8. The construction of claim 3, wherein a space portion is disposed between the refractory body and the iron plate.
 9. The construction of claim 1, wherein the coal charging seat is made substantially wholly of a refractory body.
 10. The construction of claim 1, wherein the coal charging seat is provided with a foot portion which is effective in securing the coal charging seat to a coke oven.
 11. The construction of claim 1, wherein the coke oven cover and the coal charging seat are each made substantially of a refractory body.
 12. The construction of claim 1, wherein the refractory body is a refractory material selected from the group consisting of silicon carbide, silicon nitride, clay, high alumina, pure alumina, fused silica, zircon, cordierite, castable refractory, plastic refractory, gunning refractory and refractory brick.
 13. The construction of claim 1, wherein the coal charging seat is composed of one or more parts secured to each other.
 14. The construction of claim 13, wherein the coal charging seal is composed of four parts.
 15. The construction of claim 1, wherein a hollow portion is positioned in the coal charging seat, said hollow portion being adapted to receive hardward for securing the charging seat to a coke oven.
 16. The construction of claim 1, wherein a spline portion is positioned in the coal charging seat, said spline portion being adapted to secure the charging seat to a coke oven.
 17. A coal charging seat of a coke oven wherein said coal charging seat is made wholly of a refractory body.
 18. The coal charging seat of claim 17, wherein said coal charging seat is provided with a foot portion which is effective in securing it to a coke oven.
 19. The coal charging seat of claim 17, wherein the refractory body is a refractory material selected from the group consisting of silicon carbide, silicon nitride, clay, high alumina, pure alumina, fused silica, zircon, cordierite, castable refractory, plastic refractory, gunning refractory and refractory brick.
 20. The coal charging seat of claim 17, wherein said coal charging seat is composed of one or more parts secured to each other.
 21. The coal charging seat of claim 20, wherein said coal charging seat is composed of four parts.
 22. The coal charging seat of claim 17, wherein a hollow portion is positioned in the coal charging seat, said hollow portion being adapted to receive hardware for securing the charging seat to a coke oven.
 23. The coal charging seat of claim 17, wherein a spline portion is positioned in said coal charging seat, said spline portion being adapted to secure said charging seat to a coke oven. 